Bi-directional sound offers room-filling sound from wall-to-wall. High power 240 watts supports lower frequencies of a song. Bass Booster offers more powerful sound experience. Built-in battery offers up to 19 hours of music. IPX5 Rated weather resistant. Party Lights+ - set the mood with festive LED lighting effects. Group Play - connect multiple Samsung Sound Towers. Bluetooth Multi Connection - connect and pair two mobile devices. Sound Tower app - control lights and sound effects EQ settings and more. 1 USB 5V 2.1A port.